WO2014062011A1

WO2014062011A1 - Method and apparatus for receiving or transmitting downlink control signal in wireless communication system

Info

Publication number: WO2014062011A1
Application number: PCT/KR2013/009282
Authority: WO
Inventors: 이지현; 이승민; 김학성; 서한별; 김봉회
Original assignee: 엘지전자 주식회사
Priority date: 2012-10-18
Filing date: 2013-10-17
Publication date: 2014-04-24
Also published as: JP6254659B2; EP2911328B1; EP2911328A4; EP2911328A1; KR102196316B1; US9913261B2; JP2016500963A; CN104737479A; US20180146460A1; JP6243435B2; KR20150073971A; IN2015MN00856A; US10602499B2; US20150249974A1; CN104737479B; JP2017034712A

Abstract

The method for receiving a downlink signal by a user device in a wireless communication system according to one embodiment of the present invention comprises: a step of receiving control information relating to semi persistent scheduling via an upper layer signaling or a downlink control channel; and a step of decoding a semi persistent scheduled downlink data channel based on the control information relating to semi persistent scheduling. The method may comprise: a step of using, if the downlink control information received via the downlink control channel has a first downlink control information (DCI) format, a predetermined first parameter group from among the candidate parameter groups received via the upper layer signaling so as to decode the downlink data channel; and a step of using, if the downlink control information received via the downlink control channel has a second DCI format, a second parameter group indicated by the downlink control information from among the candidate parameter groups received via the upper layer signaling so as to decode the downlink data channel.

Description

【Specification】

[Name of invention]

Method and apparatus for receiving downlink control signal in wireless communication system

Technical Field

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus therefor for receiving or transmitting a downlink control signal in a wireless communication system.

Background Art

[2] Various devices and technologies such as machine-to-machine (M2M) communication, smart phones, and tablet PCs that require high data transmission rates have been introduced and spread. Accordingly, the amount of data required to be processed in the cell network is growing very quickly. In order to meet this rapidly increasing data processing demand, the carrier aggregation technology, the cognitive radio technology, etc. to efficiently use more frequency bands, the data capacity to be transmitted within a limited frequency Multi-antenna technology, multi-base station cooperation technology, etc. to improve. In addition, the communication environment is evolving in the direction of increasing the density of nodes that can be accessed by the user equipment. A node is a fixed point where one or more antennas can transmit / receive a radio signal with a user equipment. A communication system with a high density of nodes has a higher performance by cooperation between nodes. Can provide telecommunication services to user equipment.

[3] This multi-node cooperative communication method in which a plurality of nodes communicate with a user equipment using the same time-frequency resource is performed. Each node operates as an independent base station and communicates with the user equipment without mutual cooperation. It has much better performance in data throughput than its communication method.

[4] In a multi-node system, a plurality of nodes, each node operating as a base station or an access point, an antenna, an antenna group, a radio remote header (RRH), and a radio remote unit (RRU) Use cooperative communication. Unlike conventional centralized antenna systems in which antennas are centrally located at a base station, in a multi-node system, a plurality of nodes in a multi-node system are usually located at a distance or more apart. Prize The plurality of nodes may be managed by one or more base stations or base station controllers that control the operation of each node or schedule data to be transmitted / received through each node. Each node is connected to a base station or base station controller that manages the node through a cable or dedicated line.

[5] This multi-node system is a kind of system in that distributed nodes ^' can simultaneously communicate with a single or multiple user devices by sending / receiving different streams.

It can be seen as MIM0 (multiple input multiple output) system. However, since the multi-node system transmits signals using nodes distributed in various locations, each node is compared to the antennas of the existing centralized antenna system. The antenna should cover. The transmission area is reduced. Therefore, compared to the existing system implementing the MIM0 technology in the centralized antenna system, the transmission power required for each antenna to transmit a signal can be reduced in the multi-node system. In addition, since the transmission distance between the antenna and the user equipment is shortened, path loss is reduced, and high-speed data transmission is possible. Accordingly, the transmission capacity and power efficiency of the cell system may be increased, and communication performance of relatively uniform quality may be satisfied regardless of the position of the user equipment in the cell. In addition, in a multi-node system, since the base station (s) or base station controller (s) connected to the plurality of nodes cooperate with data transmission / reception, signal loss occurring in the transmission process is reduced. In addition, when nodes located more than a certain distance perform cooperative communication with the user equipment, correlation and interference between antennas are reduced. Therefore, according to the multi-node cooperative communication scheme, a high signal to interference-plus-noise ratio (SINR) can be obtained.

[6] Due to the advantages of the multi-node system, the multi-node system can reduce the cost of base station expansion and backhaul network maintenance in the next generation mobile communication system, and to increase service coverage, channel capacity and SINR. The system has replaced the existing centralized antenna system and is emerging as a new foundation for cell communication.

[Detailed Description of the Invention] [Technical Issues] The present invention proposes a method for receiving or transmitting downlink control information in a wireless communication system.

[8] The technical problems to be achieved in the present invention are not limited to the above technical problems, and other technical problems not mentioned above are clearly understood by those skilled in the art to which the present invention belongs from the following description. Could be.

Technical Solution

[9] A method for a user equipment to receive a downlink signal in a wireless communication system according to an embodiment of the present invention, wherein the method includes semi-persistent scheduling through higher layer signaling or a downlink control channel. Receiving relevant control information; And decoding the semi-persistently scheduled downlink data channel based on the semi-persistent scheduling related control information, wherein the method includes: downlink control information received through the downlink control channel is controlled by a first downlink control; In the case of Downlink Control information format, using a predetermined first parameter set among candidate parameter sets received through higher layer signaling to decode the downlink data channel, and downlink received through the downlink control channel. If the link control information is in the 2DCI format, using the second parameter set indicated by the downlink control information among candidate parameter sets received through higher layer signaling to decode the downlink data channel. have.

[10] Preferably, each of the candidate parameter sets may include information about a start symbol position of a downlink data channel.

[11] Preferably, each of the candidate parameter sets may include RE resource element) mapping pattern information associated with specific reference signal (s).

[12] Preferably, when the semi-persistently scheduled downlink data channel is received in a multi-media broadcast multicast service single frequency network (MBSFN) subframe, the start symbol position of the downlink data channel is the MBSFN subframe. It may be constrained to the start symbol position of the downlink data channel of the frame.

Preferably, the user equipment may be set to the transmission mode 10.

Preferably, the user equipment may be configured to receive a downlink signal from at least two _e NBs. Preferably, until the new semi-persistent scheduling related information is received, the method may include using the first parameter set or the second parameter set to decode the downlink data channel. .

[16] A user device configured to receive a downlink control signal in a wireless communication system according to another embodiment of the present invention, the user device comprising: a radio frequency (RF) unit; And a processor configured to control the RF unit, wherein the processor receives control information related to Semi Persistent Scheduling through a higher layer signaling or a downlink control channel and controls the control information related to semi-persistent scheduling. And decode the semi-persistently scheduled downlink data channel based on the processor, wherein the processor is configured to: if downlink control information received through the downlink control channel is in a first downlink control information format, Configured to use the first predetermined parameter set of the candidate parameter set received through higher layer signaling to decode the downlink data channel, and the downlink control information received through the downlink control channel is stored. If in 2DCI format, it can be The candidate is a second set of parameters of the parameter set is indicated by the downlink control information can be configured to use in decoding the downlink data channel.

Preferably, each of the candidate parameter sets may include information about a start symbol position of a downlink data channel.

[18] Preferably, each of the candidate parameter sets may include resource element (RE) mapping pattern information associated with a specific reference signal (s).

[19] Preferably, when the semi-persistently scheduled downlink data channel is received in a multi media broadcast multicast service single frequency network (MBSFN) subframe, the start symbol position of the downlink data channel is the MBSFN. It may be constrained to the start symbol position of the downlink data channel of the subframe.

Preferably, the user equipment may be set to the transmission mode 10.

Preferably, the user equipment may be configured to receive a downlink signal from at least two _e NBs. Preferably, the processor may be configured to: use the first parameter set or the second parameter set to decode the downlink data channel until new semi-persistent scheduling related information is received.

[23] The above-mentioned solutions are only some of the embodiments of the present invention, and various embodiments reflecting the technical features of the present invention will be described below by those skilled in the art. It can be derived and understood based on the detailed description.

Advantageous Effect 1

According to an embodiment of the present invention, the present invention can efficiently transmit and receive downlink control information in a wireless communication system.

[25] The effects obtained in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above are clearly described to those skilled in the art from the following description. It can be understood.

BRIEF DESCRIPTION OF THE DRAWINGS, [26] The accompanying drawings, which are incorporated in and constitute a part of the detailed description in order to provide a thorough understanding of the present invention, provide embodiments of the present invention and together with the description, explain the technical idea of the present invention. do.

1 illustrates an example of a radio frame structure used in a wireless communication system.

2 shows an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system.

3 illustrates a downlink (DL) subframe structure used in a 3GPP LTE / LTE-A system.

4 shows an example of an uplink (UL) subframe structure used in a 3GPP LTE / LTE-A system.

5 illustrates an Enhanced Physical Downlink Control Channel (EPDCCH).

FIG. 6 shows an Enhanced Physical Downlink Control Channel (EPDCCH).

FIG. 7 is a conceptual diagram illustrating a carrier aggregation (CA) scheme. 8 shows an example in which a cross carrier scheduling technique is applied.

9 shows an example of determining the number of PRB pairs included in an EPDCCH set according to an embodiment of the present invention.

10 shows an example of determining the number of PRB pairs included in an EPDCCH set according to an embodiment of the present invention.

11 illustrates an example of indicating a PRB pair included in an EPDCCH set according to an embodiment of the present invention.

[38] Figure 12 shows a block diagram of an apparatus for implementing embodiment (s) of the present invention. [Form 1 for carrying out invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details.

In some cases, in order to avoid obscuring the concepts of the present invention, well-known structures and devices may be omitted or shown in block diagram form centering on the core functions of the structures and devices. In addition, the same components will be described with the same reference numerals throughout the present specification.

In the present invention, a user equipment (UE) may be fixed or mobile, and various devices for transmitting and receiving user data and / or various control information by communicating with a base station (BS) It belongs to this. The UE is a terminal equipment (MS), a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), a wireless modem ( wireless modem, handheld device, and so on. Also, in the present invention, a BS generally refers to a fixed station communicating with the UE and / or another BS, and communicates with the UE and another BS to exchange various data and control information. The BS may be referred to in other terms such as ABS (Advanced Base Station), Node-B (NB), evolved-NodeB (NB), Base Transceiver System (BTS), Access Point, and Processing Server (PS). . In the following description of the present invention, BS is collectively referred to as eNB. In the present invention, a node refers to a fixed point capable of transmitting / receiving a radio signal by communicating with a user equipment. Various forms of eNBs may be used as nodes regardless of their name. For example, the node may be a BS, an NB, an eNB, a pico-cell eNB (PeNB), a home eNB (HeNB), a relay, a repeater, and the like. Also, the node may not be an eNB. For example, it may be a radio remote head (廳), a radio remote unit (RRU). RRH, RRU, etc. generally have lower power level than eNB's power level. RRH or below RRU, RRH / RRU is generally connected to eNB by dedicated line such as optical cable. In general, the cooperative communication by the RRH / RRU and the eNB can be performed smoothly, compared to the cooperative communication by the eNBs connected by a radio line. At least one antenna is installed at one node. The antenna may mean a physical antenna or may mean an antenna port, a virtual antenna, or an antenna group. Nodes are also called points. Unlike conventional centralized antenna systems (CASs) (i.e. single node systems) where antennas are centrally located at base stations and controlled by a single eNB controller, multiple nodes In a system, a plurality of nodes are typically located more than a certain distance apart. The plurality of nodes may be managed by one or more eNBs or eNB controllers that control the operation of each node or schedule data to be transmitted / received through each node. Each node may be connected to an eNB controller that manages the node by an eNB controller or a cable or a dedicated line. In a multi-node system, the same cell identifier (ID) or different cell ID may be used for signal transmission / reception to / from a plurality of nodes. When a plurality of nodes have the same cell ID, each of the plurality of nodes behaves like some antenna group of one cell. In a multi-node system, if the nodes have different cell IDs, such a multi-node system may be regarded as a multi-cell (eg, macro-cell / femto-cell / pico-cell) system. When the multiple cells formed by each of the plurality of nodes are configured to be overlaid according to coverage, the network formed by the multiple cells is particularly called a multi-tier network. The cell ID of the RRH / RRU and the cell ID of the eNB may be the same or may be different. When the RRH / RRU uses eNBs with different cell IDs, both the RRH / RRU and the eNB operate as independent base stations. In the multi-node system of the present invention to be described below, one or more eNBs or eNB controllers connected to a plurality of nodes may simultaneously transmit or receive signals to a UE through some or all of the plurality of nodes. You can control multiple nodes. Differences exist between multi-node systems, depending on the identity of each node, the implementation of each node, and so on, in that multiple nodes participate together in providing communication services to the UE on a given time—frequency resource. Node systems are different from single node systems (eg CAS, conventional MIM0 systems, conventional relay systems, conventional repeater systems, etc.). Thus, embodiments of the present invention relates to a method of using a part or all of the plurality of nodes performing the data authentication cooperative transmission may be ^'applied to various kinds of multi-node system. For example, although a node generally refers to an antenna group spaced apart from another node by a predetermined distance or more, embodiments of the present invention described below may be applied to a case in which the node means any antenna group regardless of the interval. For example, in case of an eNB equipped with an X-poKCross polarized antenna, embodiments of the present invention may be applied as the eNB controls a node configured as an H-pol antenna and a node configured as a V-pol antenna.

[44] Transmit / receive a signal through a plurality of transmit (Tx) / receive (Rx) nodes, or transmit / receive a downlink signal through at least one node selected from the plurality of transmit / receive nodes A communication technique that allows a node to transmit and a node receiving an uplink signal to be different is called multi-eNBMMO or CoMP (Coordinated Mult i-Point TX / RX). Cooperative transmission schemes among such cooperative communication between nodes can be largely classified into joint processing (JP) and scheduling coordinat ion. The former is divided into joint tr ansmissi on (JT) / joint reception (JR) and dynamic point selection (DPS). The latter can be divided into coordinated scheduling (CS) and coordinated beamforming (CB). DPS is also called DCSWynamic cell selection. Compared with other cooperative communication techniques _: When JP is performed among cooperative communication techniques among nodes, more diverse communication environments can be formed. JT in JP refers to a communication scheme in which a plurality of nodes transmit the same stream to the UE, and JR refers to a communication scheme in which a plurality of nodes receive the same stream from the UE. The UE / eNB synthesizes the signals received from the plurality of nodes and restores the stream. In the case of JT / JR, since the same stream is transmitted from / to a plurality of nodes, reliability of signal transmission may be improved by transmit diversity. JP DPS refers to a communication technique in which a signal is transmitted / received through a node selected according to a plurality of nodes. In the case of DPS, since a node having a good channel state between the UE and the node will be selected as a communication node, the reliability of signal transmission can be improved.

Meanwhile, in the present invention, a cell refers to a certain geographic area in which one or more nodes provide a communication service. Therefore, in the present invention, communicating with a specific cell may mean communicating with an eNB or a node that provides a communication service to the specific cell. In addition, the downlink / uplink signal of a particular cell refers to a downlink / uplink signal from / to the eNB or the node providing a communication service to the specific cell. A cell that provides uplink / downlink communication service to a UE is particularly called a serving cell. In addition, the channel state / quality of a specific cell means a channel state / quality of a channel or communication link formed between an eNB or a node providing a communication service to the specific cell and a UE. In a 3GPP LTE-A based system, a UE transmits a downlink channel state from a specific node on a channel CSI-RS (Channel State Information Reference Signal) resource to which the antenna port (s) of the specific node is assigned to the specific node. Can be measured using CSI-RS (s). In general, adjacent nodes transmit corresponding CSI-RS resources on CSI—RS resources orthogonal to each other. Orthogonality of CSI-RS resources means that the CSI-RS is determined by CSI-RS resource configuration, subframe offset, and transmission period that specify a symbol and subcarrier that carries the CSI-RS. This means that at least one of subframe configuration and CSI-RS sequence specifying subframes to which the subframes are allocated are different.

[46] In the present invention, PDCCiKPhysical Downlink Control CHannel) / PCF I CH (Physical Control Format Indicator CHanne 1) / PH I CH ((Physica 1 Hybrid automatic retransmit request Indicator CHannel) / PDSCH (Physical Downlink Shared CHannel) are DCKDownl, respectively. means a set of time-frequency resources or a set of resource elements that carry ink control informat ion (CFI) / control format indicator (CFI) / downlink ACK / ACK / NACK (ACK Negative ACK) / downlink data. In addition, PUCCH (Physical Uplink Control CHannel) / PUSCH (Physical Uplink Shared CHannel) / PRACH (Physical Random Access CHannel) are each time to carry Uplink Control Information (UCI) / Uplink Data / Random Access Signals-a set of frequency resources or Means a set of resource elements. In the present invention In particular, PDCCH / PCF I CH / PH I CH / PDSCH is assigned to PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH, respectively. / PUCCH / PUSCH / PRACH RE or

It is called PDCCH / PCF I CH / PH I CH / PDSCH / PUCCH / PUSCH / PRACH resource. Hereinafter, the expression that the user equipment transmits PUCCH / PUSCH / PRACH is used in the same sense as transmitting uplink control information / uplink data / random access signal on or through the PUSCH / PUCCH / PRACH, respectively. In addition, the expression that the eNB transmits the PDCCH / PCF ICH / PHICH / PDSCH, is used in the same meaning as transmitting downlink data / control information on or through the PDCCH / PCFICH / PHICH / PDSCH, respectively.

1 illustrates an example of a radio frame structure used in a wireless communication system. In particular, Figure 1 (a) shows a frame structure for frequency division duplex (FDD) used in the 3GPP LTE / LTE-A system, Figure 1 (b) is used in the 3GPP LTE / LTE-A system Shows a frame structure for time division duplex (TDD).

Referring to FIG. 1, a radio frame used in a 3GPP LTE / LTE-A system has a length of 10 ms (307200. Ts) and consists of 10 equally sized subframes (subframes, SFs). Numbers may be assigned to 10 subframes in one radio frame. Here, Ts represents a sampling time and is represented by Ts = l / (2048 * 15kHz). Each subframe has a length of 1 ms and consists of two slots. 20 slots in one radio frame may be sequentially numbered from 0 to 19. Each slot is 0.5ms long. The time for transmitting one subframe is defined as a transmission time interval (ΤΠ). The time resource may be classified by a radio frame number (also called a radio frame index), a subframe number (also called a subframe number), a slot number (or slot index), and the like.

The radio frame may be configured differently according to the duplex mode. For example, in the FDD mode, since downlink transmission and uplink transmission are divided by frequency, a radio frame includes only one of a downlink subframe or an uplink subframe for a specific frequency band. Downlink transmission and uplink before in TDD mode Since the songs are separated by time, a radio frame includes both a downlink subframe and an uplink subframe for a specific frequency band.

[50] Table 1 illustrates a DL-UL configuration of subframes in a radio frame in the TDD mode.

[51] [Table 1]

In Table 1, D represents a downlink subframe, U represents an uplink subframe, and S represents a special subframe. The singular subframe includes three fields of Downlink Pilot TimeSlot (DwFTS), Guard Period (GP), and Uplink Pilot TimeSlot (UpPTS). DwPTS is a time interval reserved for downlink transmission, and UpPTS is a time interval reserved for uplink transmission. Table 2 exemplifies the configuration of specific subframes.

[53] [Table 2]

2 shows an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system. In particular, FIG. 2 shows a structure of a resource grid of a 3GPP LTE / LTE-A system. There is one resource grid per antenna port.

Referring to FIG. 2, a slot includes a plurality of OFDMCOrthogonal Frequency Division Multiplexing symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. An OFDM symbol may mean a symbol period. Degree

2

N RB

Subcarriers

(subcarrier)

It can be represented by a resource grid composed of symbols. here,

In the slot and in the resource block (RB)

M ^UL AT ^DL AT ^UL

Represents the number, and RB represents the number of RBs in the UL slot. And ^V «s

It depends on the DL transmission bandwidth and the UL transmission bandwidth, respectively.

In-slot OFDM

N ^UL N ^RB

Represents the number of symbols, and ^ "represents the number of OFDM symbols in the UL slot. ^ Represents the number of subcarriers constituting one RB.

The OFDM symbol may be called an OFDM symbol, an SC—FDM symbol, or the like according to a multiple access scheme. The number of OFDM symbols included in one slot may vary in accordance with the channel bandwidth, the length of the CP. For example, in case of a normal CP, one slot includes 7 OFDM symbols. In case of an extended CP, one slot includes 6 OFDM symbols. Although FIG. 2 illustrates a subframe in which one slot includes 7 OFDM symbols for convenience of description, embodiments of the present invention can be applied to subframes having different numbers of OFDM symbols in the same manner. Referring to FIG. 2, each

The 0FDM symbol, in the frequency domain,

Includes subcarriers Types of subcarriers include data subcarriers for data transmission and reference signals for transmission of reference signals. It can be divided into null subcarriers for subcarriers, guard bands, and DC components. The null subcarrier for the DC component is a subcarrier left unused and is mapped to a carrier frequency (carrier freqeuncy, fO) during the OFDM signal generation process or frequency upconversion. The carrier frequency is also called the center frequency.

N DL I UL

[57] One RB is defined as (eg, 7) consecutive OFDM symbols in the time domain and is defined by (eg, 12) consecutive subcarriers in the frequency domain. . For reference, a resource composed of one OFDM symbol and one subcarrier is called a resource element (RE) or tone (tgme). Therefore, one RB is

^{It consists of Symb} * ^V -resource elements. Each resource element in the resource grid may be uniquely defined by an index pair (k, 1) in one slot. k is from 0 in the frequency domain

^ And RB * ^l sc index imparted to 1, I is an index which is assigned from 0 in the time domain to _i -1

Two RBs occupying Λ consecutive identical subcarriers in one subframe and one located in each of two slots of the subframe are referred to as physical resource block (PRB) pairs. . Two RBs constituting a PRB pair have the same PRB number (or also referred to as a PRB index). VRB is a kind of logical resource allocation unit introduced for resource allocation. VRB has the same size as PRB. According to the method of mapping VB to PRB, VRB is divided into localized type VRB and distributed type VRB. Localized type VRBs are mapped directly to PRBs, so that a VRB number (also called a VRB index) corresponds directly to a PRB number. That is, ηρκΒ = η ™. Localized VRBs are numbered from 0 to N ^DL WB-1 in order, where N ^DL VRB = N ^DL RB. Therefore, according to the localization mapping method, VRBs having the same WB number are mapped to PRBs having the same PRB number in the first slot and the second slot. On the other hand, the distributed type VRB is mapped to the PRB through interleaving. Therefore, a distributed type VRB having the same VRB number may be mapped to PRBs having different numbers in the first slot and the second slot. Two PRBs, one located in two slots of a subframe and having the same VRB number, are called VRB pairs. 3 illustrates a downlink (DL) subframe structure used in a 3GPP LTE / LTE-A system.

Referring to FIG. 3, a DL subframe is divided into a control region and a data region in the time domain. Referring to FIG. 3, up to three (or four) OFDM symbols located at the front of the first slot of a subframe correspond to a control region to which a control channel is allocated. Hereinafter, a resource region available for PDCCH transmission in a DL subframe is called a PDCCH region. The remaining OFDM symbols other than the OFDM symbol (s) that is used for the control region are available for the PDSCH ^(Phys' ical Downlink Shared CHannel), a data area (data region) to be allocated. Hereinafter, a resource region available for PDSCH transmission in a DL subframe is called a PDSCH region. Examples of DL control channels used in 3GPP LTE include PCFICH (Physical Control Format Indicator Channel), PDCCH (Physical Downlink Control Channel), PHICH (Physical Hybrid ARQ indicator Channel). The PCFICH is transmitted in the first 0FDM symbol of a subframe and carries information on the number of 0FDM symbols used for transmission of the control channel within the subframe. The PHICH carries HARQ Hybrid Automatic Repeat Request (ACK) / ACK / Ngat (acknowledgment-acknowledgment) signals in response to UL transmission.

Control information transmitted through the PDCCH is referred to as downlink control information (DCI). DCI is resource allocation information for a UE or UE group. Contains other control information. For example, the DCI may include a transmission format and resource allocation information of a downlink shared channel DL-SCH, a transmission format and resource allocation information of an uplink shared channel (UL-SCH), and a paging channel. channel, PCH), system information on DL-SCH, resource allocation information of upper layer control messages such as random access response transmitted on PDSCH, transmit power control command for individual UEs in UE group (Transmit Control Co. and Set), a transmit power control command, voice over IP (activation) indication information, DAI (Downlink Assignment Index), and the like. The transmission format and resource allocation information of a downlink shared channel (DL-SCH) may also be called DL scheduling information or a DL grant, and an uplink shared channel (UL-SCH). The transmission format and the resource allocation information of the is also called UL scheduling information or UL grant (UL grant). DCI carried by one PDCCH has its size and purpose according to DCI format. Is different and its size may vary depending on the coding rate. In the current 3GPP LTE system, various formats such as formats 0 and 4 for uplink, formats 1, 1A, IB, 1C, ID, 2, 2k, 2B, 2C, 3, and 3A are defined for downlink. Hopping flag, RB allocation, MCSC modulat ion coding scheme, redundancy version, NDKnew data indicator, transmit power control, and cyclic shift DMRS Control information such as demodulation reference signal (UL) index, CQ I (channel quality information) request, DL assignment index (DL assignment index), HARQ process number, TPMI (transmitted precoding matrix indicator), PMKprecoding matrix indicator (PMK) information The combination is transmitted to the UE as downlink control information.

In general, the DCI format that can be transmitted to the UE depends on a transmission mode (TM) configured in the UE. In other words, not all DCI formats may be used for a UE configured in a specific transmission mode, but only certain DCI format (s) corresponding to the specific transmission mode may be used.

The PDCCH is transmitted on an aggregation of one or a plurality of consecutive control channel elements (CCEs). CCE is a logical allocation unit used to provide a PDCCH with a coding rate based on radio channel conditions. The CCE corresponds to a plurality of resource element groups (REGs). For example, one CCE corresponds to nine REGs and one REG corresponds to four REs. In the 3GPP LTE system, a CCE set in which a PDCCH can be located is defined for each UE. The CCE set in which the UE can discover its PDCCH is referred to as a PDCCH search space, simply a search space (SS). An individual resource to which a PDCCH can be transmitted in a search space is called a PDCCH candidate. The collection of PDCCH candidates that the UE will monitor is defined as a search space. In the 3GPP LTE / LTE-A system, a search space for each DCI format may have a different size, and a dedicated search space and a common search space are defined. The dedicated search space is a UE-specific search space, configured for each individual UE. The common search space is configured for a plurality of UEs. The following illustrates the aggregation levels that define the search spaces.

[64] [Table 3]

Search Space Number of PDCCH

One PDCCH candidate corresponds to 1, 2, 4, or 8 CCEs according to a CCE aggregation level. The eNB sends the actual PDCCH (DCI) on any PDCCH candidate in the search space, and the UE monitors the search space to find the PDCCH (DCI). In this case, monitoring means attempting decoding of each PDCCH in a corresponding search space according to all monitored DCI formats. The UE may detect its own PDCCH by monitoring the plurality of PDCCHs. Basically, since the UE does not know where its PDCCH is transmitted, every subframe attempts to decode the PDCCH until all PDCCHs of the corresponding DCI format have detected a PDCCH having their own identifiers. It is called blind detect ion (blind decoding, BD).

The eNB may transmit data for the UE group or the UE group through the data region. Data transmitted through the data area is also called user data. In order to transmit user data, a physical downlink shared channel (PDSCH) may be allocated to the data area. Paging channel (PCH) and downlink ink-shared channel (DL-SCH) are transmitted through PDSCH. The UE may read data transmitted through the PDSCH by decoding control information transmitted through the PDCCH. Information indicating to which UE or UE group data of the PDSCH is transmitted and how the UE or UE group should receive and decode PDSCH data is included in the PDCCH and transmitted. For example, a particular PDCCH is masked with a cyclic redundancy check (CRC) with a Radio Network Temporary Identity (RNTI) of "A", a radio resource (eg, a frequency location) of "B", and a "C" Regarding data transmitted using transmission type information (e.g., transmission block size, modulation scheme, coding information, etc.) Assume that information is transmitted on a specific DL subframe. The UE monitors the PDCCH using its own RNTI information. A UE having an RNTI detects the PDCCH and receives the PDSCH indicated by "B" and "C" through the received PDCCH information. .

In order to demodulate the signal received by the UE from the eNB, a reference signal reference signal (RS) to be compared with the data signal is required. The reference signal refers to a signal of a predetermined special waveform that the eNB transmits to the UE or the UE transmits to the eNB, and the eNB and the UE know each other, also called a pilot (pi lot). Reference signals are divided into a cell-specific RS shared by all UEs in a cell and a demodulation ion RS (DMRS) dedicated to a specific UE. The DMRS. that the eNB transmits for demodulation of downlink data for a specific UE may also be referred to as UE-specific RS. In downlink, the DM RS and the CRS may be transmitted together, but only one of the two may be transmitted. However, when only the DM RS is transmitted without a CRS in the downlink, the DM RS transmitted by applying the same precoder as the data may be used only for demodulation purposes, so that a channel measuring RS should be separately provided. For example, in 3GPP LTE (—A), an additional measurement RS, CSI-RS, is transmitted to the UE so that the UE can measure channel state information. The CSI-RS is transmitted every predetermined transmission period consisting of a plurality of subframes, unlike the CRS transmitted every subframe, based on the fact that the channel state is not relatively large over time.

Referring to FIG. 4, a UL subframe may be divided into a control region and a data region in the frequency domain. One or several physical uplink control channels (PUCCHs) may be allocated to the control region to carry uplink control information (UCI). One or several physical upl ink shared channels (PUSCHs) may be allocated to the data region of the UL subframe to carry user data.

In a UL subframe, subcarriers having a long distance based on a direct current (DC) subcarrier are used as a control region. In other words, subcarriers located at both ends of the UL transmission bandwidth are allocated for transmission of uplink control information. DC subcarriers are components that are left unused for signal transmission and are carrier frequency during frequency upconversion. mapped to f0. The PUCCH for one UE is allocated to an RB pair belonging to resources operating at one carrier frequency in one subframe, and the RBs belonging to the RB pair occupy different subcarriers in two slots. The PUCCH allocated in this way is expressed as that the RB pair allocated to the PUCCH is frequency hopped at the slot boundary. However, if frequency hopping is not applied, RB pairs occupy the same subcarrier.

[71] The PUCCH may be used to transmit the following control information.

[72]-SR (Scheduling Request): UL UL—Information used to request SCH resources. It is transmitted using ωκ (0η-0ίί Keying).

[73] HARQ-ACK: A response to a PDCCH and / or a response to a downlink data packet (eg codeword) on a PDSCH. It indicates whether the PDCCH or PDSCH has been successfully received. In response to a single downlink codeword, one bit of HARQ-ACK is transmitted, and two bits of HARQ-ACK are transmitted in response to two downlink codewords. HARQ-ACK response includes a positive ACK (simple, ACK), negative ACK (hereinafter NACK), DTX (Discontinuous Transmission) or NACK / DTX. Here, the term HARQ-ACK is commonly used with HARQ ACK / NACK, ACK / NACK.

[74]-Channel State Information (CSI): Feedback information on a downlink channel. MUL0 (Mult iple Input Multiple Output) -related feedback information includes RKRank Indicator and PMK Precoding Matrix Indicator.

The amount of uplink control information (UCI) that a UE can transmit in a subframe depends on the number of SC-FDMA available for transmission of control information. SC-FDMA available for UCI means the remaining SC-FDMA symbol except for the SC-FDMA symbol for transmitting the reference signal in the subframe, and in the case of a subframe in which a Sounding Reference Signal (SRS) is configured, The last SC— FDMA symbol is also excluded. The reference signal is used for coherent detection of the PUCCH. PUCCH supports various formats according to the transmitted information. Table 4 below shows a mapping relationship between PUCCH format and UCI in LTE / LTE-A system.

[76] [Table 4]

Referring to Table 4, the PUCCH format 1 series is mainly used for transmitting ACK / NACK information, and the PUCCH format 2 series is mainly used for channel state information such as CQI / PMI / RI. CSI), and the PUCCH format 3 series is mainly used to transmit ACK / NACK information.

[78] Reference Signal (RS)

When transmitting a packet in a wireless communication system, since the transmitted packet is transmitted through a wireless channel, the signal is distorted in the transmission process. May occur. In order to properly receive the distorted signal at the receiver, the distortion must be corrected in the received signal using the channel information. In order to find out the channel information, a signal known to both the transmitting side and the receiving side is transmitted, and a method of finding the channel information with the degree of distortion when the signal is received through the channel is mainly used. The signal is called a pilot signal or a reference signal.

In case of transmitting / receiving data using multiple antennas, it is necessary to know the channel condition between each transmitting antenna and the receiving antenna to receive the correct signal. Thus, each song A separate reference signal should exist for each new antenna and more specifically for each antenna port (antenna port).

The reference signal may be divided into an uplink reference signal and a downlink reference signal. In the current LTE system, as an uplink reference signal,

I) Demodulation at ion-Reference Signal (DM-RS) for channel estimation for coherent demodulation of information transmitted on PUSCH and PUCCH

Ii) There is a sounding reference signal (SRS) for the base station to measure the uplink channel quality of the network at different frequencies.

[84] Meanwhile, in the downlink reference signal,

[85] Cell-Specific Reference Signal (CRS) shared by all UEs in 0sal

[86] ii) UE-specific Reference Signal for Specific UE Only [87] iii) DeModul at ion-Reference Signal (DM-RS) when PDSCH is transmitted for coherent demodulation )

Iv) Channel State Information Reference Signal (CSI-RS) for Delivering Channel State Information (CSI) When Downlink DMRS is Transmitted

[89] v) MBSFN Reference Signal, which is transmitted for coherent demodulation of a signal transmitted in the Multimedia Broadcast Single Frequency Network (MBSFN) mode.

Vi) There is a Positioning Reference Signal used to estimate the geographical location information of the UE.

Reference signals can be classified into two types according to their purpose. There is a reference signal for the purpose of obtaining channel information and a reference signal used for data demodulation. In the former, since the UE can acquire downlink and channel information, it should be transmitted over a wide band and must receive the RS even if a UE does not receive downlink data in a specific subframe. It is also used in situations such as handover. The latter is a reference signal transmitted together with a corresponding resource when the base station transmits a downlink, and the terminal can demodulate data by performing channel measurement by receiving the reference signal. This reference signal should be transmitted in the area where data is transmitted.

[92] Enhanced PDCCH (EPDCCH) General Due to the introduction of the multi-node system, various communication techniques can be applied to improve channel quality. However, in order to apply the aforementioned MIM0 technique and inter-cell cooperative communication technique to a multi-node environment, a new control channel may be used. Due to this need, the newly introduced control channel is called EPDCCH (Enhanced—PDCCH), and is used in the data region (hereinafter referred to as PDSCH region) instead of the existing control region (hereinafter referred to as PDSCH region). It was decided to assign. In conclusion, it is possible to transmit the control information for the node for each terminal through the EPDCCH can also solve the problem that the existing PDCCH region may be insufficient. For reference, the EPDCCH is not provided to the legacy legacy terminal, and can be received only by the LTE-A terminal.

5 is a diagram illustrating an EPDCCH and a PDSCH scheduled by an EPDCCH.

Referring to FIG. 5, an EPDCCH may generally define and use a part of a PDSCH region for transmitting data, and a UE performs a blind decoding process for detecting the presence or absence of its own EPDCCH. Should be. The EPDCCH performs the same scheduling operation as the existing PDCCH (ie PDSCH and PUSCH control), but when the number of UEs connected to a node such as an RRH increases, a larger number of EPDCCHs are allocated in the PDSCH region to perform the UE. There is a drawback that the complexity can be increased by increasing the number of times of the BLANAD decoding to be performed.

On the other hand, it is also necessary to consider a method of multiplexing the EPDCCH. In detail, a scheme has been proposed in which a plurality of UEs' EPDCCHs are multiplexed in a form of cross interleaving in a frequency domain or a time domain with a common resource region, that is, a common PRB set.

FIG. 6 is a diagram illustrating a method of multiplexing EPDCCHs for a plurality of UEs.

In particular, (a) of FIG. 6 illustrates an example in which a common PRB set is configured in units of PRB pairs and cross interleaving is performed based on this. On the other hand, FIG. 6B illustrates an example in which a common PRB set is configured only in units of PRBs and cross-interleaving is performed based on this. This approach has the advantage of achieving diversity gain in terms of frequency / time domain over multiple RBs.

[99] Carrier Aggregation Hereinafter, a carrier aggregation (CA) scheme will be described. 8 is a conceptual diagram illustrating carrier aggregation (CA).

A CA is a frequency block or cell (in logical sense) in which a terminal is composed of uplink resources (or component carriers) and / or downlink resources (or component carriers) in order for a wireless communication system to use a wider frequency band. By means of a plurality of means using a large logical frequency band means. Hereinafter, for convenience of description, the term component carrier will be unified.

Referring to FIG. 7, the entire system bandwidth (System Bandwidth; System BW) has a bandwidth of up to 100 MHz as a logical band. The entire system band includes five component carriers (CCs), and each component carrier has a maximum bandwidth of 20 MHz. A component carrier includes one or more contiguous subcarriers that are physically contiguous. In FIG. 8, although each component carrier has the same bandwidth, this is only an example, and each component carrier may have a different bandwidth. In addition, although each component carrier is shown as being adjacent to each other in the frequency domain, the figure is shown in a logical concept, each component carrier may be physically adjacent to each other or may be separated.

The center frequency may be used differently for each component carrier or may use one common common carrier for component carriers that are physically adjacent to each other. For example, in FIG. 8, assuming that all component carriers are physically adjacent to each other, the center carrier A may be used. In addition, assuming that each component carrier is not physically adjacent to each component carrier, a center carrier A, a center carrier B, or the like may be used separately.

In the present specification, a component carrier may correspond to a system band of a legacy system. By defining a component carrier based on a legacy system, provision of backward compatibilities and system design may be facilitated in a wireless communication environment in which an evolved terminal and a legacy terminal coexist. For example, when the LTE-A system supports CA, each component carrier may correspond to a system band of the LTE system. In this case, the component carrier may have any one of 1.25, 2.5, 5, 10, or 20 MHz bandwidth. When the entire system band is extended to a CA, the frequency band used for communication with each terminal is defined in component carrier units. UE A may use 100 MHz, which is the entire system band, and performs communication using all five component carriers. Terminals B1 to B5 can only use 20 z bandwidth and perform communication using one component carrier. Terminals C1 and C2 may use a 40 MHz bandwidth and perform communication using two component carriers, respectively. The two component carriers may or may not be logically / physically adjacent to each other. UE C1 represents the case of using two non-contiguous component carriers, and UE C2 represents the case of using two adjacent component carriers.

. In the LTE system, one downlink component carrier and one uplink component carrier are used, whereas in the LTE-A system, several component carriers may be used. In this case, a method of scheduling a data channel by the control channel may be classified into a conventional linked carrier scheduling method and a cross carrier scheduling (CCS) method.

More specifically, in link carrier scheduling, like a conventional LTE system using a single component carrier, a control channel transmitted through a specific component carrier only schedules a data channel through the specific component carrier.

On the other hand, in the cross scheduling, a control channel transmitted through a primary CC using a carrier indicator field (CIF) is transmitted through the primary component carrier or another component carrier. Scheduling the data channel transmitted through.

8 is a diagram illustrating an example in which a cross carrier scheduling technique is applied. In particular, in FIG. 8, the number of cells (or component carriers) allocated to the UE is three, and as described above, the cross carrier scheduling scheme is performed using the CIF. Here, it is assumed that downlink cell (or component carrier) # 0 and uplink cell (or component carrier) # 0 are primary downlink component carriers (ie, primary cell; PCell) and primary uplink component carriers, respectively. The remaining component carriers are assumed to be secondary component carriers (ie, secondary cell (SCell)).

[110] Coordinated Multiple Point transmission and reception (CoMP) general According to the improved system performance requirements of the 3GPP LTE-A system, CoMP transceiver technology (also referred to as ccHlIMO, collaborative MIM0 or network MIM0) has been proposed. CoMP technology can increase the performance of the UE located at the cell-edge and increase the average sector throughput.

[112] In general, in a multi-cell environment with a frequency reuse factor of 1, the performance and average sector yield of a UE located in a cell-boundary due to Inter-Cell Interference (ICI) This can be reduced. In order to reduce this ICI, the existing LTE system uses a simple passive technique such as fractional frequency reuse (FFR) through UE-specific power control to locate a cell-boundary in an environment constrained by interference. A method was applied to ensure that the UE has adequate yield performance. However, rather than lowering the frequency resource usage per cell, it may be more desirable to reduce the ICI or reuse the ICI as a signal desired by the UE. In order to achieve the above object, CoMP transmission scheme can be applied.

[113] The CoMP technique that can be applied in the case of downlink is largely a joint-processing (JP) technique and a coordination i ^ j ^^ / ^ i ^ oKcoordinateds chedu 1 i ng / beam f or mi ng; CS / CB) technique.

[114] The JP technique may use data at each point (base station) of the CoMP cooperative unit. CoMP cooperative unit means a set of base stations used in a cooperative transmission scheme, and may also be referred to as a CoMP set. The JP technique can be classified into a joint transmission technique and a dynamic cell selection technique.

The joint transmission scheme refers to a scheme in which PDSCH is transmitted from a plurality of points (part or all of CoMP cooperative units) at a time. That is, data transmitted to a single UE may be transmitted simultaneously from multiple transmission points. According to the joint transmission technique, the quality of a received signal can be improved coherently or non-coherent ly, and can also actively cancel interference to another UE. .

The dynamic cell selection scheme refers to a scheme in which PDSCHs are transmitted from one point (of CoMP cooperative units) at a time. That is, data transmitted to a single UE at a specific point in time is transmitted from one point, and at that point, other points in the cooperative unit do not transmit data to the corresponding UE, and points for transmitting data to the UE are dynamically selected. Can be. Meanwhile, according to the CS / CB scheme, CoMP cooperative units may cooperatively perform the broadforming of data transmission for a single UE. Here, data is transmitted only in the serving cell, but user scheduling / beamforming may be determined by coordination of cells of a corresponding CoMP cooperative unit.

Meanwhile, in the uplink case, cooperative or coordinated multi-point reception means receiving a signal transmitted by coordination of a plurality of geographically separated points. CoMP schemes applicable to uplink can be classified into joint reception (JR) and coordinated scheduling / beamforming (CS / CB).

[119] The JR scheme means that a signal transmitted through a PUSCH is received at a plurality of reception points. In the CS / CB scheme, a PUSCH is received at only one point, but user scheduling / beamforming is performed in cells of CoMP cooperative units. Means determined by the adjustment.

[120] In the meantime, a plurality of UL points (ie, receiving points (RPs)) are referred to as UL CoMP, and a plurality of DL points (ie, a transmitting point (TP)) are multiples. The case may be referred to as DL CoMP.

[121] quasi co-located (QCL)

[122] FIG. 9 illustrates a wireless communication system in which a UE receives a joint transmission (JT) service from a CoMP set. That is, the UE is an example when it is set to the transmission mode 10.

In FIG. 9, the UE receives data from all transmission points (TPs) belonging to the CoMP group, for example, TP1 and TP2, and thus the UE receives data for all TPs belonging to the CoMP group. Channel status information can be transmitted. In this case, RSs may also be transmitted from the plurality of TPs in the CoMP set to the UE. Can come to such a case, it can be shared by one another if the standing properties for channel estimation from different ports of the other RS TP, will be able to reduce the load and complexity of the reception processing of the UE ^'. In addition, if the characteristics for channel estimation from different RS ports of the same TP can be shared among RS ports, the load and complexity of the reception processing of the UE may be reduced. Accordingly, the current LTE (-A) system proposes a method of sharing characteristics for channel estimation between RS ports. [124] For channel estimation between these RS ports, the LTE (-A) system introduced the concept of "quasi co-located (QCL)". For example, between two antenna ports, a radio channel in which a large-scale property of a radio channel through which one symbol is transmitted through one antenna port is transmitted through another antenna port If it can be inferred from, it can be said that the two antenna ports are pseudo co-located. Here, the wide range characteristics include one or more of delay spread, Doppler spread, Doppler shift, average gain, and average delay. In the future, the pseudo co-located is simply referred to as QCL.

In other words, two antenna ports are QCLed, which means that the broad characteristics of the radio channel from one antenna port are the same as those of the radio channel from the other antenna port. Considering a plurality of antenna ports through which a reference signal (RS) is transmitted, when the antenna ports through which two different RSs are transmitted are QCLed, a wide range of characteristics of a radio channel from one type of antenna port is changed to another type of antenna. It could be replaced by the broad nature of the wireless channel from the port.

[126] In accordance with the concept of QCL, the UE cannot assume the same broad characteristics between radio channels from the corresponding antenna ports for non-QCL antenna ports', i.e. in this case the UE acquires and tracks timing. Independent processing must be performed for each set non-QCL antenna port for tracking, frequency offset estimation, compensation delay estimation, and Doppler estimation.

[127] For antenna ports that can assume QCL, the UE has the advantage that it can perform the following operations:

[128]-For delay spread and Doppler spread, the UE calculates the power-delay—profile, delay spread and Doppler spectrum, Doppler spread estimates for the radio channel from one antenna port, from the other antenna port. The same applies to the Wiener filter used for channel estimation for the channel.

[129] -For frequency shift and received timing, the UE may perform time and frequency synchronization for one antenna port and then apply the same synchronization to demodulation of another antenna port. [130]-With respect to average received power, the UE may average Reference Signal Received Power (RSRP) measurements for two or more antenna ports.

[131] When the UE receives a specific DMRS-based DL—related DCI format through a control channel (PDCCH or ePDCCH), the UE performs channel demodulation after performing channel estimation for the corresponding PDSCH through a DMRS sequence. For example, if the UE's configuration of antenna ports (hereinafter referred to as "DMRS port") for transmission of DMRS received from this DL scheduling grant is the CRS of its DL serving cell or another cell If a QCL assumption can be made with antenna ports (hereinafter referred to as " CRS Port ") for transmitting the < Desc / Clms Page number 5 > This can be used to improve the processor performance of DMRS-based receivers.

Since the CRS is a reference signal broadcasted at a relatively high density in every subframe and the entire band as described above, an estimate of the wider characteristic is generally obtained more stably from the CRS. Because this is possible. On the other hand, DMRS is UE-specifically transmitted for a specific scheduled RB, and since the precoding matrix used by the eNB for transmission can be changed in units of PRG, the effective channel received by the UE is changed in units of PRG. Even if multiple PRGs are scheduled, performance degradation may occur when DMRS is used to estimate the wide characteristics of a wireless channel over a wide band. The CSI-RS can have a transmission period of several to several tens of ms and has a low density as an IRE per antenna port (received in 2RE units when CDM is applied) on average per RB. When used for estimation of the wide range of characteristics, performance degradation may occur.

That is, the QCL assumption between the antenna ports may be used for receiving various downlink reference signals, channel estimation, channel state reporting, and the like.

[134] SPS Scheduling

Semi-persistent scheduling (SPS) is a scheduling scheme that enjoys the overhead of control signaling and efficiently uses resources for limited control channels. SPS is a method used when the UE uses time-frequency resources within a relatively long time period, and accordingly, signaling for resource allocation repeatedly in the predetermined time period causes signaling overhead, and thus is allocated to the UE. Time-frequency resources (and Area) can be scheduled at one time. Therefore, if a time-frequency resource for the SPS is allocated to the UE in one subframe, the UE can use the corresponding time-frequency resource without a separate control channel in the SPS—subframe that is periodically repeated thereafter. All.

SPS can be particularly useful for communication such as Voice over Internet Protocol (VoIP), where timing and necessary resources can be predicted. RRC and PDCCH are used to set the SPS. Intervals of radio resources that are periodically allocated are indicated through RRC, and specific resource allocation information (transmission attributes such as frequency domain RA and ICS) is transmitted through PDCCH. SPS uses a special identifier such as SPS C-R TI to distinguish it from general dynamic scheduling.

[137] The present invention relates to a method for determining PDSCH related parameters including a start symbol of an SPS-scheduled PDSCH. According to an embodiment of the present invention, a problem when two or more EPDCCHs are configured in one subframe. To deal with.

As briefly described above, EPDCCH refers to a PDCCH transmitted to an existing PDSCH region for increasing the capacity of a control signal, and uses a UE-specific reference signal (RS) to transmit a beam. There is an advantage to the forming gain. When using the EPDCCH, it may be assumed that the start symbol position of the PDSCH is the same as the start symbol position of the EPDCCH, and the start symbol position of the EPDCCH may be transmitted through an upper layer signal such as an RRC. However, the position of the start symbol position of the PDSCH may be independent of that of the EPDCCH and may be determined according to the information of the PCFICH (eg, CFKcontrol formation indicator) or may use a predetermined value.

The eNB may configure (configure) the EPDCCH or reconfigure the start symbol position of the EPDCCH, and the EPDCCH configuration parameter including the start symbol position of the EPDCCH is transmitted to the UE through an upper layer signal such as an RRC. The UE may receive the EPDCCH configuration parameter after the SPS is configured through the PDCCH or may be configured through the PDCCH after receiving the EPDCCH configuration parameter. As described above, the reception of the SPS configuration and the EPDCCH configuration parameter may be simultaneously performed. At this time, if the subframe configured for the SPS corresponds to a subframe in which the UE should monitor the EPDCCH, the corresponding subframe may be a periodic resource region scheduled through the SPS configuration. It is necessary to determine the start symbol position of the SPS-scheduled PDSCH. This indicates that the starting symbol position of the SPS—scheduled PDSCH is indicated by the PCFICH. The value indicated in the PCFICH is different from the starting symbol position (or the position derived from the position) of the EPDCCH included in the EPDCCH configuration parameter received through the RRC signal. Because you can.

Therefore, when the UE receives the EPDCCH configuration parameter after the SPS configuration or the SPS configuration after receiving the EPDCCH configuration parameter, the UE starts the EPDCCH included in the EPDCCH configuration parameter in preference to the PDSCH start symbol position determined by the PCFICH. Assume that the symbol location (or the location derived therefrom) is the starting symbol location of the SPS-scheduled PDSCH. In this case, it is assumed that the start symbol position of the SPS-scheduled PDSCH is the same as the start symbol position of the EPDCCH or may be derived from the start symbol position of the EPDCCH. If such an assumption does not apply, the eNB determines the SPS—scheduling. The RC may signal the start symbol position of the PDSCH separately, and the UE which has received the RRC signal may have priority over the PCFICH information.

[141] However, even if the UE receives the EPDCCH configuration parameter including the PDSCH start symbol position after the SPS configuration or the SPS configuration after receiving the EPDCCH configuration parameter including the PDSCH start symbol position, the SPS ᅳ scheduled subframe is determined by the UE. If the EPDCCH does not correspond to the subframe to be monitored, the start symbol position of the SPS—scheduled PDSCH follows the PCFICH. This is because the EPDCCH may also be configured to be monitored only in some subframes.

10 illustrates an example of determining a start symbol position of an SPS-scheduled PDSCH (hereinafter, referred to as an SPS-PDSCH) according to an embodiment of the present invention described above. In FIG. 10, a UE configured with an SPS received an EPDCCH configuration parameter including an EPDCCH start symbol position through RRC signaling, and illustrates an operation in which a corresponding position (symbol nl) is different from a value indicated by the PCFICH (symbol ηθ). The start symbol position of the SPS-PDSCH is determined to be symbol nl because it is set to follow the RRC signaled information in preference to the information indicated by the PCFICH.

The method of determining the start symbol location of the SPS-PDSCH is a common promise between the eNB and the UE. In a problematic situation, that is, in a subframe in which the SPS is set and the UE should monitor the EPDCCH, the eNB starts the EPDCCH start symbol. The SPS-PDSCH must be scheduled or transmitted from the UE, and the UE must decode the SPS-PDSCH from the EPDCCH start symbol position. Meanwhile, the eNB may transmit two or more EPDCCH configuration parameters to the UE, where each EPDCCH configuration parameter may include a start symbol position of each EPDCCH and may be delivered to the UE through an upper layer signal such as RRC. If the start symbol positions of the EPDCCHs included in two or more EPDCCH configuration parameters are the same, the UE regards the start symbol position of the RRC signaled EPDCCH as the start symbol position of the SPS—PDSCH. However, the start symbol position of each EPDCCH included in two or more EPDCCH configuration parameters may be different. In this case, a problem arises in that the start symbol position of the SPS-PDSCH needs to be determined. Therefore, in this case, the UE assumes that the value of the start symbol positions of each EPDCCH is larger, that is, the OFDM symbol index is larger among the start symbol positions of each EPDCCH as the start symbol positions of the SPS_PDSCH. This is especially true when each EPDCCH is transmitted from different TPs, such as DPSCDynamic Point Scheduling), considering that each TP will preferably disable the first few OFDM symbols in consideration of the interference environment. By setting the position conservatively, it is possible to minimize the effects of inter-cell interference.

11 illustrates an operation of determining a start symbol position of an SPS-PDSCH when an SPS configured UE according to an embodiment of the present invention has received two or more EPDCCH-related parameters. If the start symbol position of EPDCCH # 1 is symbol nl and the start symbol position of EPDCCH # 2 is symbol n2, max (nl, n2) becomes the start symbol position of SPS-PDSCH. In FIG. 2, the start symbol position of the SPS-PDSCH is determined to be nl assuming nl> = n2.

[146] As another method of determining the start symbol position of the SPS-PDSCH when two or more different EPDCCH configuration parameters (that is, start symbol positions of two or more EPDCCHs) are signaled to the UE, the value of the start symbol position of each EPDCCH is determined. A small one may be promised as the start symbol location of the SPS-PDSCH. Alternatively, in a problematic situation (eg, a subframe in which SPS is set and EPDCCH monitoring is required), a predetermined specific position is promised to be the SPS-PDSCH start symbol position or separately through separate RRC signaling. The UE may inform the UE of the start symbol position of the SPS-PDSCH. As another method, a representative EPDCCH among two or more EPDCCHs may be set and the start symbol position of the representative EPDCCH may be determined as the start symbol position of the SPS-PDSCH. Prescribe regular representative EPDCCH may ^decide, as a representative to the method of signaling the first EPDCCH to. In another method, a method of determining a start symbol location of an SPS—PDSCH in a subframe for detecting an EPDCCH (that is, a subframe in which the UE should monitor the EPDCCH) is a type of a control channel scheduling an SPS-PDSCH. It may be determined according to. For example, if the SPS is scheduled as an EPDCCH, the EPDCCH set including the scheduling EPDCCH is determined as the representative EPDCCH set, and the start symbol position of the EPDCCH is the start symbol position of the SPS-PDSCH in the EPDCCH detection subframe. On the other hand, if the corresponding SPS is scheduled as PDCCH, the SPS-PDSCH in the EPDCCH detection subframe is applied by selecting a large value among the start symbol positions of the two EPDCCH sets or selecting the first of the EPDCCH sets as a representative. It is possible to determine the starting symbol position of. On the other hand, this method of determining the start symbol position may be limited only when there is no explicit indicator for the start symbol position of the SPS-PDSCH.

Next, another embodiment in which the embodiment of the present invention described above is more generalized will be described. If more than one EPDCCH can be configured for the UE, the start symbol position of each EPDCCH may be different. Meanwhile, each EPDCCH may be transmitted from a different TP, and each EPDCCH (black is a PDSCH scheduled to the corresponding EPDCCH) may have a rate matching pattern associated with a start symbol position of a PDSCH and a specific reference signal (eg, CRS or CSI-RS). (Or PDSCH RE mapping pattern), antenna port setting (e.g., DM-RS antenna port setting used for EPDCCH / PDSCH decoding), and / or reference signal (e.g., DM-RS) The initial value (seed) and the scrambling identifier (scrambling ID) of the pseudo random sequence used for generating a thing may be different.

Accordingly, in the case of the UE configured with SPS, not only the start symbol position of the SPS-PDSCH but also the above-listed parameters applied to the SPS-PDSCH should be determined. The UE may receive information of two or more applicable parameter sets (ie, a plurality of candidate parameter sets) through higher layer signals such as R C.

[150] A) The UE is SPS—PDSCH is always applied to the serving cell's CRS pattern, and the DM-RS used for decoding the SPS-PDSCH (or EPDCCH) is quasi co-located with the CRS of the serving cell. You can set the rules of the assumption that

[151] B) A parameter set that is actually applied among the parameter sets applicable to the SPS-PDSCH may be signaled to the UE through an upper layer signal such as an RRC. Received this The IE assumes that the parameter set signaled by RRC is applied to the SPS-PDSCH. In particular, the signaling may be transmitted together while performing SPS scheduling (setting).

C) Parameters applied to the SPS-PDSCH may always follow that of the serving cell as described in A) above, but may be determined to follow that of the control channel that scheduled the corresponding SPS. In other words, if the SPS is scheduled through a specific control channel at a particular point in time, the parameters to be applied to the SPS—PDSCH follow the parameters applied to the transmission of the particular control channel until another control channel is transmitted to perform the SPS configuration. will be. For example, if the SPS is scheduled by the PDCCH, the parameters of the PDCCH, that is, the parameters of the serving cell, are followed. When the SPS is scheduled by the EPDCCH, the parameters used for transmission of the corresponding EPDCCH are followed.

D) Parameters applied to the SPS-PDSCH can be designated through a control channel for scheduling the corresponding SPS. In other words, if the SPS is scheduled through a specific control channel at a specific time, the parameter to be applied to the SPS-PDSCH is a parameter indicated through the specific control channel until another control channel is transmitted so that the SPS—PDSCH is scheduled. To follow. The difference from C) is that the parameter used for the specific control channel and the parameter indicated by the indicator transmitted through the specific control channel may be different. For example, if it is indicated to perform rate matching according to the CRS pattern of the adjacent cell through the PDCCH transmitted using the parameter of the CRS of the serving cell, according to D), the subsequent SPS—PDSCH is used to indicate the adjacent cell indicated above. Rate matching should be performed according to the CRS pattern.

[154] E) When two or more EPDCCHs are configured, the parameters applied to the SPS-PDSCH may define a rule that assumes that a particular EPDCCH of the corresponding EPDCCH follows that of a specific EPDCCH. For example, if the UE receives two or more EPDCCH configuration parameters via RRC, the parameters applied to the SPS-PDSCH may be promised to always follow the configuration parameters of the first EPDCCH.

[155] F) Parameters applied to the SPS-PDSCH may be configured to use a predetermined one. At this time, this parameter may be different from that of the EPDCCH. In particular, this scheme may be applied regardless of whether the channel that scheduled the SPS-PDSCH is a PDCCH or an EPDCCH. [156] G) Parameters applied to the SPS-PDSCH may allow to follow the parameters of the dynamic PDSCH. A dynamic PDSCH is a PDSCH that can be transmitted using two or more different parameter sets, and which parameter set is used for a specific PDSCH is included in the DCI detected in the PDCCH or EPDCCH and transmitted to the UE. Accordingly, the UE can know the parameters applied in the dynamic PDSCH by interpreting the DCI, and can determine a rule assuming that the parameters applied to the SPS-PDSCH are the same as those of the dynamic PDSCH between the UE and the eNB.

The information related to such an operation may be implicitly identified according to a predetermined rule or the _e NB may inform the UE through a predefined signal (eg, a higher layer signal or a physical layer signal). have. In addition, different schemes may be applied depending on the type of scheduling message for performing SPS scheduling (eg, DCI format). In particular, a different operation scheme may be applied depending on whether an indicator indicating a parameter applied to the PDSCH is present in the scheduling message. Can be applied.

For example, when SPS scheduling is performed with the scheduling message in which the indicator exists, the same method as in D) may be used, but in the case where a scheduling message in which the indicator does not exist is used, the A or B is used. ), C) and the like.

In addition, some of the various parameters applied to the PDSCH may be determined according to different methods. For example, the start symbol of the SPS-PDSCH uses that of the control channel that scheduled the SPS according to C). The CRS to be assumed for matching may use the CRS of the serving cell according to A), and the CSI-RS to be assumed for rate matching may use a series of parameters previously signaled to RRC according to B). In particular, this operation may be effective when there is no explicit indicator in the parameter related to the SPS scheduling message.

More specifically, by using a method for determining a parameter applied to the SPS_PDSCH according to D) in a subframe set to DCI format 2D, and to the B) in a subframe set to DCI format 0 or 1A. A method of determining a parameter applied to another SPS-PDSCH may be used.

On the other hand, in determining the start symbol position of the SPS-PDSCH, in case of a subframe such that the start symbol index of the PDSCH is set to a maximum of 2, such as the MBSFN subframe, the start symbol position of the SPS-PDSCH is Should be constrained to symbol # 2. For example, RRC If the larger of the start symbol position of EPDCCH set through signaling is assumed to be the start symbol position of SPS-PDSCH, if the value is larger than 2, use the corresponding value. Otherwise, if it is smaller than 2, use symbol # 2. Assume

[162] This means that not only the larger of the start symbol positions of the EPDCCH is assumed to be the start symbol position of the SPS—PDSCH, but also the following methods, that is, the PCFICH or the smaller of the start symbol positions of the EPDCCH or the start of the representative EPDCCH. It can be applied to all methods such as following symbol positions.

Some of the methods described above are summarized in the table below. If the UE does not receive the EPDCCH setting parameter including the EPDCCH start symbol position information before or after the SPS has been set (ie, there is no EPDCCH setting), the UE indicates the starting symbol position (index) of the SPF-PDSCH. ) ("1" in the table below). The UE assumes the start symbol position of the EPDCCH as the start symbol position of the SPS-PDSCH when the SPS is configured after receiving the EPDCCH start symbol position information in the state of SPS setup or after receiving the EPDCCH start symbol position information ("2" in the table below). ). If two or more EPDCCH start symbol positions are different, the start symbol position of the SPS-PDSCH is the larger of the two ("3" in the table below). In case of MBSFN subframe, when receiving the start symbol position information of two or more EPDCCHs, the larger of the two is followed. If the value is smaller than 2, the start symbol position of the SPS-PDSCH is assumed to be symbol # 2 (4). .

[164] [Table 5]

The series of operations described above may be selectively applied according to the configuration of the subframe. For example, in case of MBSFN subframe, since SPS-PDSCH is transmitted based on DM-RS, it is possible to use one of a series of methods based on DMDC-based EPDCCH configuration parameter. Information such as CRS and CSI-RS to be assumed in rate matching may be obtained. On the other hand, in the case of non-MBSFN subframes, the SPS-PDSCH can be transmitted based on the CRS. In this case, the starting symbol position of the SPS-PDSCH is derived from the PCFICH of the serving cell or the rate for the CRS of the adjacent cell. An operation such as not assuming a match may be performed. In the case of a non-MBSFN subframe, when the SPS-PDSCH is transmitted based on the DM-RS, one of the above-described methods based on the DM-RS based EPDCCH configuration parameter may be used.

[166] The embodiments described above are the start symbol of the EPDCCH as the premise may be ^viewed, to be assumed that it does not overlap with the PDCCH transmission area. If there is no such assumption, in determining the start symbol position of the SPS-PDSCH, the start symbol position of EPDCCHs and the PDSCH start symbol position derived as an indicator transmitted by the PCFICH may be considered together. For example, in the same manner as in the case of "3" of Table 5, if the PDSCH start symbol index derived from PCFICH is larger than the start symbol index of EPDCCHs, the value derived from PCFICH is used as the start symbol of SPS-PDSCH. You can also decide by location.

Meanwhile, when carrier aggregation (CA) is configured, the UE may simultaneously monitor the PDCCH and the EPDCCH in a specific subframe. For example, in the case of a UE configured with CCS (cross carrier scheduling), the PDSCH of the PCell of the UE may be scheduled by the EPDCCH transmitted to the PCell, while the PDSCH of the SCell may be CCS by the PDCCH transmitted to the PCell. . In this case, the following method may be used to determine the start symbol position of the PDSCH of the PCell.

[168] a) Method of Assume Start Symbol Location of EPDCCH

A method of assuming that the subframe is a subframe in which the UE should monitor the EPDCCH. In particular, since the PDSCH of the PCell is scheduled by the EPDCCH, it may also be viewed as following the start symbol position of the scheduling channel.

B) a method of assuming a start symbol position derived from the PCFICH;

This subframe is regarded as a subframe for monitoring USS JE—specific search space (PDCCH). Especially,. Starting symbol position of EPDCCH is RRC signaling If it is not set to overlap with the PDCCH region, the start symbol position derived from the PCFICH has a value equal to or smaller than the start symbol index of the EPDCCH, and thus may be more efficient in terms of resource utilization.

[172] This may be particularly useful if the scheduling of the PDSCH of the PCell does not have an explicit indicator for the start symbol location of the PDSCH of the PCell. If there is the indicator yen, it is also possible to apply a method of determining outer listed above method a starting symbol position indicated by the indicator as ^"small symbol positions when the PCell PDSCH. In particular, even in the case of PDSCH of SCel l, if the PDSCH scheduling of the SCell includes an explicit indicator, the value indicated by the indicator is given priority over the start symbol position that is semi-statically determined by RRC. Can be determined.

In this case, it is assumed that the EPDCCH configuration parameters including the EPDCCH start symbol position are set through a higher layer signal or use a predetermined value. If there is no higher layer signal, the EPDCCH start symbol position may be derived from the PCFICH.

On the other hand, the CCS set UE may be SPS activated (PCS) of the PCell is scheduled through the SPDC PDSCH of the PCell. In this case, the method of determining the SPS-PDSCH start symbol position and parameters of various SPS-PDSCHs applied when the aforementioned carrier aggregation is not configured may be applied as it is. However, in the case of the start symbol position of the SPS-PDSCH of the PCell, the UE may monitor the PDCCH due to the CCS for the SCell even in a subframe in which the EPDCCH should be monitored. Promises to follow may also be used.

Meanwhile, when the PDSCH of the SCell is CCS by the PDCCH or the EPDCCH transmitted to the PCell, the start symbol of the PDSCH of the SCell may be determined as follows.

A) follows the start symbol position of the PDSCH of the SCell signaled by RRC;

[177] b ') When an explicit indicator for the start symbol position of the PDSCH of the SCell is included in the scheduling message of the PDSCH of the SCell transmitted in the PDCCH / EPDCCH, the UE follows the start symbol position indicated by the indicator. . This method is irrelevant whether the scheduling message is sent on the PDCCH or the EPDCCH.

[178] c ') when the scheduling of the PDSCH of the SCell transmitted in the PDCCH / EPDCCH does not include an explicit indicator for the start symbol of the PDSCH of the SCell, the method A) ~ G) Using me, I can determine the start symbol position of the PDSCH of the SCell or / and parameters to be applied to the PDSCH of the SCell. However, at this time, since the start symbol position of the PDSCH of the SCell set to RRC exists, it is possible to use the start symbol position designated by the corresponding RRC.

12 is a block diagram illustrating components of a transmitter 10 and a receiver 20 that perform embodiments of the present invention. The transmitter 10 and the receiver 20 are RFCRadio Frequency (13, 23) units capable of transmitting or receiving wired and / or wireless signals carrying information and / or data, signals, messages, and the like, and wirelessly. It is operatively connected to components such as memory (12, 22), the RF unit (13, 23) and the memory (12, 22) for storing various information related to communication in the communication system, to control the components Each device includes a processor 11, 21 configured to control the memory 12, 22 and / or the RF unit 13, 23 to perform at least one of the embodiments of the invention described above.

The memory 12, 22 may store a program for processing and controlling the processor 11, 21, and may temporarily store input / output information. Memory 12, 22 can be utilized as a buffer. The processors 11 and 21 typically control the overall operation of various models in the transmitter or the receiver. In particular, the processors 11 and 21 may perform various control functions for carrying out the present invention. Processors 11 and 21 may also be referred to as controllers, microcontrollers, microprocessors, microcomputers, and the like. The processors 11 and 21 may be implemented by hardware or firmware, software, or a combination thereof. When implementing the present invention using hardware, application specific integrated circuits (ASICs) or digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and FPGAs configured to carry out the present invention. field programmable gate arrays and the like may be provided in the processors 400a and 400b. On the other hand, when implementing the present invention using the firmware or software can be a firmware or software configured to include a ^"modeul, procedure, or a function, which performs functions or operations of the present invention, to perform the invention The configured firmware or software may be provided in the processor 11, 21 or stored in the memory 12, 22 to be driven by the processor 11, 21. The processor 11 of the transmission apparatus 10 may be configured to perform a predetermined encoding and / or reception on a signal and / or data which is scheduled from the processor 11 or a scheduler connected to the processor 11 and transmitted to the outside. After the modulation (modulation) is transmitted to the RF unit (13). For example, the processor 11 converts the data sequence to be transmitted into K layers through demultiplexing, channel encoding, scrambling, and modulation. The coded data string is also called a codeword and is equivalent to a transport block, which is a data block provided by the MAC layer. One transport block (TB) is encoded into one codeword, and each codeword is transmitted to a receiving device in the form of one or more layers. For frequency upconversion the RF unit 13 may include an oscillator. The RF unit 13 may include Nt transmit antennas, where Nt is a positive integer greater than or equal to one.

The signal processing of the receiving device 20 is configured in the reverse of the signal processing of the transmitting device 10. Under the control of the processor 21, the RF unit 23 of the receiver 20 receives a radio signal transmitted by the transmitter 10. The RF unit 23 may include Nr receive antennas, and the RF unit 23 converts each of the signals received through the receive antennas into frequency down-converted baseband signals. RF unit 23 may include an oscillator for frequency downconversion. The processor 21 may decode and demodulate the radio signal received through the reception antenna to restore the data originally intended to be transmitted by the transmitter 10.

The RF unit 13, 23 is equipped with one or more antennas. The antenna transmits a signal processed by the RF units 13 and 23 to the outside or receives a radio signal from the outside according to an embodiment of the present invention under the control of the processors 11 and 21. , 23) to carry out the function. Antennas are also referred to as antenna ports. Each antenna may correspond to one physical antenna or may be configured by a combination of more than one physical antenna element. The signal transmitted from each antenna can no longer be decomposed by the receiver 20. A reference signal (RS) transmitted for the corresponding antenna defines the antenna as viewed from the perspective of the receiving device 20, and whether the channel is a single radio channel from one physical antenna or includes the antenna. Regardless of whether it is a composite channel from a plurality of physical antenna elements, the receiver 20 enables channel estimation for the antenna. That is, the antenna is a channel for transmitting a symbol on the antenna is the channel through which another symbol on the same antenna is transmitted It is defined to be derived from. In the case of an RF unit supporting a multi-input multi-output (MIM0) function for transmitting and receiving data using a plurality of antennas, it may be connected to two or more antennas.

In the embodiments of the present invention, the UE operates as the transmitter 10 in the uplink and operates as the receiver 20 in the downlink. In addition, in the embodiments of the present invention, the eNB operates as the receiver 20 in the uplink, and operates as the transmitter 10 in the downlink.

The transmitting device 10 and / or the receiving device 20 may perform at least one or a combination of two or more embodiments of the present invention described above.

[186] The detailed description of the preferred embodiments of the present invention as described above is provided to enable those skilled in the art to implement and practice the present invention. Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will understand that various modifications and changes can be made to the present invention as set forth in the claims below. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Industrial Applicability

The present invention can be used in a communication device such as a terminal, a relay, a base station, and the like.

Claims

[Range of request]

[Claim 1]

In the method for receiving a downlink signal from the user equipment in a wireless communication system,

Receiving semi persistent scheduling related control information through higher layer signaling or a downlink control channel; And

Decoding a semi-persistently scheduled downlink data channel based on the semi-persistent scheduling related control information, the method comprising:

If the downlink control information received through the downlink control channel is in a first downlink control information format, the downlink data includes a first predetermined parameter set among candidate parameter sets received through higher layer signaling. Used to decode the channel, and

If the downlink control information received through the downlink control channel is a second DCI format, the downlink data channel includes a second parameter set indicated by the downlink control information among candidate parameter sets received through higher layer signaling. Receiving a downlink signal, characterized in that it is used to decode

[Claim 2]

The method of claim 1, wherein each of the candidate parameter sets includes information about a start symbol position of a downlink data channel.

[Claim 3]

The method of claim 2, wherein each of the candidate parameter sets includes resource element (RE) mapping pattern information associated with a specific reference signal (s).

[Claim 4]

The method of claim 1, wherein the semi-persistently scheduled downlink data channel is MBSFN (Mult imedia Broadcast multicast service Single Frequency Network) If received from a frame,

The start symbol position of the downlink data channel is restricted to the start symbol position of the downlink data channel of the MBSFN subframe.

[Claim 5]

[8] The method according to claim U, wherein the user equipment is set to transmission mode 10.

[Claim 6]

The method according to claim U, wherein the user equipment is configured to receive a downlink signal from at least two eNBs.

[Claim 7]

The method of claim 4, further comprising using the first parameter set or the second parameter set to decode the downlink data channel until new semi-persistent scheduling related information is received. Link signal reception method.

[Claim 8]

In a user equipment configured to receive a downlink control signal in a wireless communication system,

Radio frequency (RF) units; And

A processor configured to control the RF unit,

The processor receives semi-persistent scheduling related control information through higher-level signaling or downlink control channel, and decodes the semi-persistently scheduled downlink data channel based on the semi-persistent scheduling related control information. The processor is configured to:

If the downlink control information received through the downlink control channel is in a first downlink control information format, the downlink data includes a first predetermined parameter set among candidate parameter sets received through higher layer signaling. Configured to use to decode the channel, and

If the downlink control information received through the downlink control channel is a second DCI format, the downlink of the candidate parameter set received through higher layer signaling And use the second parameter set indicated by control information to decode the downlink data channel.

[Claim 9].

10. The user equipment of claim 8, wherein each of the candidate parameter sets includes information about five start symbol positions of a downlink data channel.

[Claim 10]

9. The user equipment of claim 8, wherein each of the candidate parameter sets includes resource element (RE) mapping pattern information associated with a specific reference signal (s).

0

[Claim 11]

10. The method of claim 8, wherein the semi-persistently scheduled downlink data channel is received in a multi-media broadcast multicast service single frequency network (MBSFN) subframe.

Wherein the start symbol position of the downlink data channel is constrained to the start symbol position of the lower half data channel of the MBSFN subframe.

【Claim 12】 _,

The user equipment according to claim 8, wherein the user equipment is set to a transmission mode 10.

0

【Claim 13】 ·

The user equipment according to claim 8, wherein the user equipment is configured to receive a downlink signal from at least two eNBs.

[Claim 14]

The system of claim 8, wherein the processor is:

5 wherein the first parameter set or the second parameter set is used to decode the downlink data channel until new semi-persistent scheduling related information is received.